chore(all): auto-regenerate .pb.go files (googleapis#624)

This is an auto-generated regeneration of the .pb.go files by
cloud.google.com/go/internal/gapicgen. Once this PR is submitted, genbot will
update the corresponding PR to depend on the newer version of go-genproto, and
assign reviewers. Whilst this or any regen PR is open in go-genproto, genbot
will not create any more regeneration PRs. If all regen PRs are closed,
gapicgen will create a new set of regeneration PRs once per night.

If you have been assigned to review this PR, please:

- Ensure that CI is passing. If it's failing, it requires your manual attention.
- Approve and submit this PR if you believe it's ready to ship. That will prompt
genbot to assign reviewers to the google-cloud-go PR.

Corresponding google-cloud-go PR: googleapis/google-cloud-go#4314

Changes:

chore: regenerate API index

  Source-Link: googleapis/googleapis@ffc5313

feat: Network Management public protos
  Committer: @alexander-fenster
  PiperOrigin-RevId: 381277241
  Source-Link: googleapis/googleapis@125b03c

chore: regenerate API index

  Source-Link: googleapis/googleapis@6425b1d

fix!(aiplatform): Add C#, PHP and Ruby options for all AI Platform protos
  This is a breaking change for C#, PHP and Ruby, but none of those languages have published libraries for AI Platform.

  PiperOrigin-RevId: 381271921
  Source-Link: googleapis/googleapis@955fee2